本文概述SRI国际组织多年的研究成果,目的在于把经典的静态断裂力学概念扩展到短期脉冲加载的情况。在短脉冲载荷下,裂纹失稳的准则是根据Sih-Achenbach应力强度解推出的。为了观察裂纹失稳现象和证实短脉冲准则,曾进行了聚合物和金属合金的撞击试验。对短脉冲断裂力学的这种新认识,正在被用来帮助发展高速断裂试验的方法,并指导断裂孕育时间的研究。 This article outlines the many years of SRI research efforts aimed at extending the classical concept of static fracture mechanics to the case of short-term pulsed loading. Under short pulse loads, the criterion for crack instability is derived from the Sih-Achenbach stress intensity solution. In order to observe the phenomenon of crack instability and confirm short pulse criteria, impact experiments on polymers and metal alloys were performed. This new understanding of bursting mechanics is being used to help develop methods for high-speed fracture testing and to guide the study of fracture gestation time.